Signaling apparatus for automobiles and the like



Aug. 13, 1929. GALBARINI 1,724,187

' SIGNALING APPARATUS FOR AUTOMOBILES AND THE LIKE Filed Dec. 29, 1927 2' 3/ t z" 4 e 6 8 9 163 "j" Maw, WM. m

Patented Aug. 13, 1929.

UNITED STATES 1,724,187 PATENT OFFICE.

ANTONIO GALBARINI, 0F MILAN, ITALY.

SIGNALING APPARATUS FOR AUTOMOBILES AND THE LIKE.

Application filed December 29, 1927, Serial No. 243,311, and in Italy January 4, 1927.

This invention relates to signaling apparatus for automobiles and the like and has for its object to provide a simple and efiicient signaling device which is operated alternately by the suction from the engine and the atmosphere.

A further object of the invention is to provide a signaling apparatus to overcome certain and important defects in signaling apparatus hitherto used, which latter are generally controlled by hand, utilizing the exhaust gases from the engine, the pressure of which varies between large limits, consequently they have to be regulated and moreover the exhaust gases are highly contaminated with oil and other combustion prod ucts thus efi'ecting the proper working of the engine when used for operating the signaling apparatus.

The signaling apparatus according to this invention eliminates the above disadvantages, comprises a cup shaped member, a sonorous membrane adapted to close the end of said member, a second membrane within said member forming intermittent contact with the first mentioned membrane, means for providing coarse and fine adjustment between said membranes, means for the admission of atmospheric air, and means for forming communication between said cup shape member and suction pipe.

The accompanying drawing is a sectional elevation of one form of signaling apparatus according to this invention.

A thin metal sonorous membrane 1 forms the end wall of a cup shape member 2 communicating by way of a tube 3 with the suction pipe of the motor. Said membrane is held in position by locking rings 1, 1 and a second membrane 4 is resiliently secured by means of an elastic ring 5 and threaded ring 6 against the annular ridge 2 provided in the cup shape member 2. Said second mentioned membrane 4 is provided with a tubular extension? the outer end 8 which is adapted to form intermittent contact with the sonorous membrane 1.

The cup shape member 2 is divided into two parts, 2 and 2" by means of the membrane 4. The part 2" of the cup shape memher 2 is in communication with the atmosphere by way of ports 9, and the part 2 is in communication with the suction pipe by way of thetube 3 which contains any well known type of closing valve, which latter, when opened, owing to the superior elasticity 3 is in direct communication with the suction pipe, thereby producing a series of vibrations, and the sound produced is very clear, as the vibrating membrane 4 simply works as an interrupter, in order to produce a corresponding quick change of pressure on one of the sonorous membrane faces, being unlike other apparatus, in which the sonorous membranes vibrations is caused from the collision with a solid body in quick motion or a quick vibration.

In order to avoid a too strong a contact between the interrupting membrane4 and the sonorous membrane 1, a delicate adjustment of the membrane 4 is provided by screwing or unscrewing as the case may be, the threaded ring 6, and a coarse adjustment is also provided between the two membranes 1 and 4 by means of the screw collar 11 mounted onto the periphery of the cup shape member 2, and said collar 11 also serves to hold the sonorous membrane 1 in position and the rear end of said cup shape member 2 is closed by a removable cover, 12,'inserted over the cup shape member 3 and secured thereto by a nut 13.

The concordant vibrations of the two membranes 1 and 4 allow a perfect working of the signaling apparatus even when the pressure within the cup shape member 2 varies between large limits, thus avoiding the use of special means for regulating the pressure.

The sonorous waves produced on one side of the membranes 1 and 4 pass through the horn 14 screwed into the collar 11, and a second horn 15 surrounding the horn 14 is secured to the collar 11, is adapted to collect the sonorous waves produced on the opposite face of the membranes to those collected by the horn 14, and also serves to allow air to pass by way of the ports 9 to the cup shape member 2 as herein set forth.

The signaling apparatus has the advantage that while the same is working, the carburetor receives an additional quantity of first mentioned membrane, means for providair which improves the efiiciency of the motor,and the apparatus can be combined with a two-way cock and the like for operating same or by the direct admission of additional air into the motor.

If desired the same arrangement of acoustic apparatus can be used for the working of pressure trumpets or horns, instead of the depression kind as herein set forth by simply changing the position of admission or exhausting of the cup'shape member 2.

- I do not limit the invention to the exact details of construction as herein set forth as these may be varied without departing from the invention.

I claim r 1 A signaling apparatus for automobiles comprising a cup shaped member, a sonorous membrane adapted to close the end of said member, .a second membrane, a tubular extension int'egral therewith within said member forming intermittent contact with the first mentioned membrane, means for providing coarse and fine adjustment between said membranes, means for the admission of atmospheric air, and means for formlng communication between said cup shaped member and suction pipe.

2. A signaling apparatus for automobiles comprising a cup shape member, a sonorous membrane adapted to close the end of sa d member, a second membrane within said member, a tubular extension integral therewith forming intermittent contact with said ing coarse and fine adjustment between said membranes, means for admission of atmospheric air, means for forming communicar tion between said cup shape member and suction pipe, and means for conveying the sound waves through separate horns. A

3. A signaling apparatus for automobiles comprising a cup shape member, a sonorous membrane closing the open end of said member, an elastic ring within said member, a second membrane mounted over said elastic ring, a threaded ring screwed into said cup shaped member, the second mentioned mem-. brane being interposed between said elastic ring and threaded ring, a tubular extension integral with the second mentioned membrane, means for providing coarse adjustment between said membranes, means for admission of atmospheric air, means for forming communication between said cup shape member and suction pipe, and means for conveying the sound waves produced.

4. A signaling apparatus for automobiles comprising a cup shape member, an annular ridge provided in the base, a sonorous membrane closing said member, an elastic ring resting upon said annular ridge, a'second membrane within said member, a threaded ring screwed into said member, the second mentioned'membrane being interposed between said elastic ring and threaded ring, a tubular extension integral with said second mentioned membrane forming intermittent contact with the first mentioned membrane, a screw collar mounted over said cup shape member for providing a coarse adjustment between said membranes, means for admission of atmospheric air, means for forming communication between said cup shape member, and suction pipe and means'for conveying the sound waves produced.

5. A signaling apparatus for automobiles comprising a cup shape member, an annular ridge provided in the base, a sonorous membrane closing said member, an elastic rin resting upon said annular ridge, a secon membrane within said member, a threaded ring screwed into said member, the second mentioned membrane being interposed between said elastic ring and threaded ring, a tubular extension integral with said second mentioned membrane forming intermittent contact with the first mentioned membrane, a screw collar mounted over said cup shape member for providing a coarse adjustment between said membranes, ports formed in said cup shape member for admission of atmospheric air, means for forming communication between said cup shape member and suction pipe, and means for conveying the sound waves produced.

6. A signaling apparatus for automobiles comprising a cup shape member, an annular ridge provided in the base, a sonorous membrane closing said member, an elastic ring resting upon said annular ridge, a second membrane within said member, a threaded ring screwed into said member, the second mentioned membrane being interposed between saidelastic ring and threaded ring, a tubular extension integral with said second mentioned membrane forming intermittent contact with the first mentioned membrane, a screw collar mounted over said cup shape member for providing a coarse adjustment between said membranes, ports formed in said cup shaped member for admission of atmospheric air, a tube provided in the base of the cup shape member in communication with the suction pipe, a removable cover inserted over said tube, a nut adapted to hold said removable cover in position, and means for conveying sound waves produced.

7. A signaling apparatus for automobiles comprising a cup shape member, an annular ridge provided in the base thereof, a sonorous membrane closing said member, an elastic ring mounted on said annular ridge, a second membrane, a threaded ring screwed into said cup shape member, the second mentioned membrane being interposed between said elastic ring and threaded ring, a tubular extension formed on one side of second mentioned membrane,,forming intermittent contact with the first mentioned membrane,

. shape member for admission of air, a tube provided in the base of the cup shape mem- =1ber in communication with the suction'pipe,

a removable cover inserted over said tube, a nut securing said cover 1n posltlon, two concentrically arranged horns, the lnner horn being screwed into said screw collar, the out- 10 or horn mounted over said screw collar, a i locking ring adapted to hold said outer horn in position, said outer horn being in direct communication with the cup shape member through the ports and the sound waves pro- 15 duced by said membranes are conveyed through the respective horns.

. ANTONIO GALBARINI. 

